if (damage > 0) 
   { 
    if (hp > damage) 
     set_user_health(i, hp - damage) 
    else 
     set_user_health(i, 1) 
   }

   if (damage > 0) 
   { 
    if (hp > damage) 
     set_user_health(i, hp - damage) 
    else 
     set_user_health(i, 0) 
   }